Question:
What is a characteristic of the DMVPN IPsec tunnel mode?
- It encrypts both the GRE and ESP headers.
- It encrypts and authenticates only the original packet payload.
- It uses the original IP header to routes packets.
- It encrypts the entire original packet and the GRE IP header.
Explanation: There are two modes of DMVPN IPsec operation, tunnel mode and transport mode. In ESP tunnel mode the entire original packet and the GRE IP header are encrypted and a new IPsec IP header is added which is used to route the packet.
Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – VPNs Exam
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